You can interpolate one of the signals to make them the same size. Something like this:
Signal1 = (linspace(1,30,30))';
Signal2 = (linspace(1,30,180))'; %don't mind this, just creating your signals with different frequencys
Signal1_int = interp1(1:size(Signal1,1),Signal1.',linspace(1,size(Signal1,1),size(Signal2,1)))';
%interpolating the first signal so it's the same size as the second
Now you can plot both signals in one plot.
plot(t,Signal1_int,t,Signal2);
Or just use hold on and hold off.
